Cutting tool and cutting insert therefor

摘要

An indexable cutting insert has opposing rhombus-shaped upper and lower surfaces and a peripheral side surface therebetween with alternating obtuse and acute corner surfaces. A nose cutting edge is formed at the intersection of the upper surface with each of the two acute corner surfaces. The lower surface includes a base surface from which a central boss and exactly two engagement ridges protrude. Each engagement ridge extends from the central boss to intersect with its respective acute corner surface, and the base surface is divided into two base sub-surfaces. The insert may be clamped against a seating surface of a tool holder pocket solely by the engagement ridge located closest to the operative nose cutting edge making contact with a corresponding single engagement groove, and the two base sub-surfaces making contact with two coplanar raised support surfaces.

主权项

1. A single-sided indexable cutting insert (30) comprising:
opposing rhombus-shaped upper and lower surfaces (32, 34) and a peripheral side surface (36) therebetween, the peripheral side surface (36) having alternating obtuse and acute corner surfaces (38, 40) separated by four relief surfaces (42), the two acute corner surfaces (40) representing the two furthest spaced apart corner surfaces; a central axis (A1) passing through the upper and lower surfaces (32, 34), about which central axis the cutting insert (30) is indexable; and a nose cutting edge (44) formed at the intersection of the upper surface (32) with each of the two acute corner surfaces (40), the lower surface (34) comprising: a base surface (46); and a central boss (48) and exactly two engagement ridges (50) protruding from the base surface (46), the central boss (48) having a raised boss end surface (52), and each engagement ridge (50) including a pair of parallelly extending ridge flank surfaces (54) forming a V-shaped cross-section, wherein each engagement ridge (50) intersects one of the acute corner surface (40) and extends therefrom towards the central axis (A1) to intersect the central boss (48), and the base surface (46) is divided into at least two separate base sub-surfaces (56).